package com.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.reggie.common.BaseContext;
import com.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 用来校验用户是否已经登录完成
 * 如果登录完成，放行
 * 没登录 提示去登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取请求的uri
        String requestURI = request.getRequestURI();
        log.info("【拦截到的uri】={}", requestURI);
       //定义不需要拦截的请求地址
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.本次不需要处理，直接放行
        if (check){
            log.info("【本次请求{}不需要处理】",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4判断登录状态，如果已登录 直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            Long empId = (Long)request.getSession().getAttribute("employee");
            BaseContext.set(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //4判断登录状态，如果已登录 直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            Long empId = (Long)request.getSession().getAttribute("user");
            BaseContext.set(empId);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //5.未登录返回未登录结果 通过输出流返回响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            //校验匹配
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
